That being said, there are some possible changes to how the posting history pages work, that might help in the future. One, posters should have access to all of their own past posts. Two, posters should only have access to a limited set of other people's posts - maybe the last two weeks or month or so. Three, people who are not registered or logged in should not have any access at all to the posting histories of users. Period. Granted, you can still find out a lot from Google, but FR archives all your posts, whereas Google actually only catches a small fraction of the posts that you make here.
As far as web bugs go, there isn't a heck of a lot anyone here can do about it. If you don't trust someone, don't load images from them, is about the extent of it.